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      JDK1.8 LocalDate
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        <h5 id="LocalDateTime"><a href="#LocalDateTime" class="headerlink" title="LocalDateTime"></a>LocalDateTime</h5><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">表示日期的LocalDate </span><br><span class="line">表示时间的LocalTime </span><br><span class="line">表示日期时间的LocalDateTime</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 从默认时区的系统时钟获取当前的日期时间。不用考虑时区差</span></span><br><span class="line">LocalDateTime date = LocalDateTime.now();</span><br><span class="line"><span class="comment">//2018-07-15T14:22:39.759</span></span><br><span class="line">System.out.println(date);</span><br><span class="line"></span><br><span class="line">System.out.println(date.getYear());</span><br><span class="line">System.out.println(date.getMonthValue());</span><br><span class="line">System.out.println(date.getDayOfMonth());</span><br><span class="line">System.out.println(date.getHour());</span><br><span class="line">System.out.println(date.getMinute());</span><br><span class="line">System.out.println(date.getSecond());</span><br><span class="line">System.out.println(date.getNano());</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 手动创建一个LocalDateTime实例</span></span><br><span class="line">LocalDateTime date2 = LocalDateTime.of(<span class="number">2017</span>, <span class="number">12</span>, <span class="number">17</span>, <span class="number">9</span>, <span class="number">31</span>, <span class="number">31</span>, <span class="number">31</span>);</span><br><span class="line">System.out.println(date2);</span><br><span class="line"><span class="comment">// 进行加操作，得到新的日期实例</span></span><br><span class="line">LocalDateTime date3 = date2.plusDays(<span class="number">12</span>);</span><br><span class="line">System.out.println(date3);</span><br><span class="line"><span class="comment">// 进行减操作，得到新的日期实例</span></span><br><span class="line">LocalDateTime date4 = date3.minusYears(<span class="number">2</span>);</span><br><span class="line">System.out.println(date4);</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 时间戳  1970年1月1日00：00：00 到某一个时间点的毫秒值</span></span><br><span class="line"><span class="comment">// 默认获取UTC时区</span></span><br><span class="line">Instant ins = Instant.now();</span><br><span class="line">System.out.println(ins);</span><br><span class="line"></span><br><span class="line">System.out.println(LocalDateTime.now().toInstant(ZoneOffset.of(<span class="string">"+8"</span>)).toEpochMilli());</span><br><span class="line">System.out.println(System.currentTimeMillis());</span><br><span class="line"></span><br><span class="line">System.out.println(Instant.now().toEpochMilli());</span><br><span class="line">System.out.println(Instant.now().atOffset(ZoneOffset.ofHours(<span class="number">8</span>)).toInstant().toEpochMilli());</span><br></pre></td></tr></table></figure>
<ul>
<li>计算时间间隔</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="comment">// Duration:计算两个时间之间的间隔</span></span><br><span class="line"><span class="comment">// Period：计算两个日期之间的间隔</span></span><br><span class="line"></span><br><span class="line">Instant ins1 = Instant.now();</span><br><span class="line"></span><br><span class="line"><span class="keyword">try</span> &#123;</span><br><span class="line">    Thread.sleep(<span class="number">1000</span>);</span><br><span class="line">&#125; <span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">    e.printStackTrace();</span><br><span class="line">&#125;</span><br><span class="line">Instant ins2 = Instant.now();</span><br><span class="line">Duration dura = Duration.between(ins1, ins2);</span><br><span class="line">System.out.println(dura);</span><br><span class="line">System.out.println(dura.toMillis());</span><br><span class="line"></span><br><span class="line">System.out.println(<span class="string">"======================"</span>);</span><br><span class="line">LocalTime localTime = LocalTime.now();</span><br><span class="line"><span class="keyword">try</span> &#123;</span><br><span class="line">    Thread.sleep(<span class="number">1000</span>);</span><br><span class="line">&#125; <span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">    e.printStackTrace();</span><br><span class="line">&#125;</span><br><span class="line">LocalTime localTime2 = LocalTime.now();</span><br><span class="line">Duration du2 = Duration.between(localTime, localTime2);</span><br><span class="line">System.out.println(du2);</span><br><span class="line">System.out.println(du2.toMillis());</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">LocalDate localDate =LocalDate.now();</span><br><span class="line"></span><br><span class="line"><span class="keyword">try</span> &#123;</span><br><span class="line">    Thread.sleep(<span class="number">1000</span>);</span><br><span class="line">&#125; <span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">    e.printStackTrace();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">LocalDate localDate2 = LocalDate.of(<span class="number">2019</span>,<span class="number">12</span>,<span class="number">12</span>);</span><br><span class="line">Period pe = Period.between(localDate, localDate2);</span><br><span class="line">System.out.println(pe.getYears());</span><br><span class="line">System.out.println(pe);</span><br></pre></td></tr></table></figure>
<ul>
<li>获取特定天数</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// temperalAdjust 时间校验器</span></span><br><span class="line"><span class="comment">// 例如获取下周日  下一个工作日</span></span><br><span class="line">LocalDateTime ldt1 = LocalDateTime.now();</span><br><span class="line">System.out.println(ldt1);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 获取一年中的第一天</span></span><br><span class="line">LocalDateTime ldt2 = ldt1.withDayOfYear(<span class="number">1</span>);</span><br><span class="line">System.out.println(ldt2);</span><br><span class="line"><span class="comment">// 获取一个月中的第一天</span></span><br><span class="line">LocalDateTime ldt3 = ldt1.withDayOfMonth(<span class="number">1</span>);</span><br><span class="line">System.out.println(ldt3);</span><br><span class="line"></span><br><span class="line">LocalDateTime ldt4 = ldt1.with(TemporalAdjusters.next(DayOfWeek.FRIDAY));</span><br><span class="line">System.out.println(ldt4);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 获取下一个工作日</span></span><br><span class="line">LocalDateTime ldt5 = ldt1.with((t) -&gt; &#123;</span><br><span class="line">    LocalDateTime ldt6 = (LocalDateTime)t;</span><br><span class="line">    DayOfWeek dayOfWeek = ldt6.getDayOfWeek();</span><br><span class="line">    <span class="keyword">if</span> (DayOfWeek.FRIDAY.equals(dayOfWeek))&#123;</span><br><span class="line">        <span class="keyword">return</span> ldt6.plusDays(<span class="number">3</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">else</span> <span class="keyword">if</span> (DayOfWeek.SATURDAY.equals(dayOfWeek))&#123;</span><br><span class="line">        <span class="keyword">return</span> ldt6.plusDays(<span class="number">2</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> ldt6.plusDays(<span class="number">1</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;);</span><br><span class="line">System.out.println(ldt5);</span><br></pre></td></tr></table></figure>
<ul>
<li>格式化时间/日期</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// DateTimeFormatter: 格式化时间/日期</span></span><br><span class="line"><span class="comment">// 自定义格式</span></span><br><span class="line">LocalDateTime ldt = LocalDateTime.now();</span><br><span class="line">DateTimeFormatter formatter = DateTimeFormatter.ofPattern(<span class="string">"yyyy年MM月dd日"</span>);</span><br><span class="line"><span class="comment">//        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");</span></span><br><span class="line">String strDate1 = ldt.format(formatter);</span><br><span class="line">String strDate = formatter.format(ldt);</span><br><span class="line">System.out.println(strDate);</span><br><span class="line">System.out.println(strDate1);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 使用api提供的格式</span></span><br><span class="line">DateTimeFormatter dtf = DateTimeFormatter.ISO_DATE;</span><br><span class="line">LocalDateTime ldt2 = LocalDateTime.now();</span><br><span class="line">String strDate3 = dtf.format(ldt2);</span><br><span class="line">System.out.println(strDate3);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 解析字符串to时间</span></span><br><span class="line">DateTimeFormatter df = DateTimeFormatter.ofPattern(<span class="string">"yyyy-MM-dd HH:mm:ss"</span>);</span><br><span class="line">LocalDateTime time = LocalDateTime.now();</span><br><span class="line">String localTime = df.format(time);</span><br><span class="line">LocalDateTime ldt4 = LocalDateTime.parse(<span class="string">"2017-09-28 17:07:05"</span>,df);</span><br><span class="line">System.out.println(<span class="string">"LocalDateTime转成String类型的时间："</span>+localTime);</span><br><span class="line">System.out.println(<span class="string">"String类型的时间转成LocalDateTime："</span>+ldt4);</span><br></pre></td></tr></table></figure>
<hr>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//获取当前日期,只含年月日 固定格式 yyyy-MM-dd    2018-21-11</span></span><br><span class="line">LocalDate today = LocalDate.now();</span><br><span class="line"></span><br><span class="line"><span class="comment">// 根据年月日取日期，6月就是6，</span></span><br><span class="line">LocalDate oldDate = LocalDate.of(<span class="number">2018</span>, <span class="number">6</span>, <span class="number">1</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 根据字符串取：默认格式yyyy-MM-dd，02不能写成2</span></span><br><span class="line">LocalDate yesteday = LocalDate.parse(<span class="string">"2018-06-03"</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 如果不是闰年 传入29号也会报错</span></span><br><span class="line">LocalDate.parse(<span class="string">"2018-02-29"</span>);</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 日期转换常用,第一天或者最后一天...</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">localDateTransferTest</span><span class="params">()</span></span>&#123;</span><br><span class="line">    <span class="comment">//2018-05-04</span></span><br><span class="line">    LocalDate today = LocalDate.now();</span><br><span class="line">    <span class="comment">// 取本月第1天： 2018-05-01</span></span><br><span class="line">    LocalDate firstDayOfThisMonth = today.with(TemporalAdjusters.firstDayOfMonth());</span><br><span class="line">    <span class="comment">// 取本月第2天：2018-05-02</span></span><br><span class="line">    LocalDate secondDayOfThisMonth = today.withDayOfMonth(<span class="number">2</span>);</span><br><span class="line">    <span class="comment">// 取本月最后一天，再也不用计算是28，29，30还是31： 2018-05-31</span></span><br><span class="line">    LocalDate lastDayOfThisMonth = today.with(TemporalAdjusters.lastDayOfMonth());</span><br><span class="line">    <span class="comment">// 取下一天：2018-06-01</span></span><br><span class="line">    LocalDate firstDayOf2015 = lastDayOfThisMonth.plusDays(<span class="number">1</span>);</span><br><span class="line">    <span class="comment">// 取2018年10月第一个周三 so easy?：  2018-10-03</span></span><br><span class="line">    LocalDate thirdMondayOf2018 = LocalDate.parse(<span class="string">"2018-10-01"</span>).with(TemporalAdjusters.firstInMonth(DayOfWeek.WEDNESDAY));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">localTimeTest</span><span class="params">()</span></span>&#123;</span><br><span class="line">    <span class="comment">//16:25:46.448(纳秒值)</span></span><br><span class="line">    LocalTime todayTimeWithMillisTime = LocalTime.now();</span><br><span class="line">    <span class="comment">//16:28:48 不带纳秒值</span></span><br><span class="line">    LocalTime todayTimeWithNoMillisTime = LocalTime.now().withNano(<span class="number">0</span>);</span><br><span class="line">    LocalTime time1 = LocalTime.parse(<span class="string">"23:59:59"</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">localDateTimeTest</span><span class="params">()</span></span>&#123;</span><br><span class="line">    <span class="comment">//转化为时间戳  毫秒值</span></span><br><span class="line">    <span class="keyword">long</span> time1 = LocalDateTime.now().toInstant(ZoneOffset.of(<span class="string">"+8"</span>)).toEpochMilli();</span><br><span class="line">    <span class="keyword">long</span> time2 = System.currentTimeMillis();</span><br><span class="line"></span><br><span class="line">    <span class="comment">//时间戳转化为localdatetime</span></span><br><span class="line">    DateTimeFormatter df= DateTimeFormatter.ofPattern(<span class="string">"YYYY-MM-dd HH:mm:ss.SSS"</span>);</span><br><span class="line"></span><br><span class="line">    System.out.println(df.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(time1),ZoneId.of(<span class="string">"Asia/Shanghai"</span>))));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
      
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